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Readest vs Koodo Reader: catalog facts
Readest	Koodo Reader
Freemium The app is free and open source under the AGPL. The optional cloud sync service has paid…	Free Free and open source under the AGPL-3.0.
Windows, macOS, Linux, Android, Web, iOS	Windows, macOS, Linux, Android, iOS, Web
Reads EPUB, PDF, MOBI, AZW3, FB2, CBZ, TXT and Markdown in one app The same reader on macOS, Windows, Linux, Android, iOS and the web	Over fifteen formats including EPUB, PDF, MOBI, AZW3, comic archives and DOCX Syncs through storage you already control rather than a vendor cloud
Cloud sync is a hosted service with paid tiers, not purely local A young project, so features and stability are still moving	It reads DRM-free files only; books bought from a store with DRM will not open Sync depends on whatever storage you configure, so the setup is on you
Downloadable app, Web application	Downloadable app, Web application
Open source	Open source
License: AGPL-3.0	License: AGPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 20, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.